Stereo-isohypsograph.



W. BAUERSFELD. STEREO ISOHYPSOGRAPH.

APPLICATION FILED APR. 24. 1914.

1,151,996. PatentedAug.31,1915.

snares raanxrernicn WALTHER BAUERSFELD, OF JENA, GERMANY, ASSIGNOR'IIIO'JIHE FIRM OI CARL ZEISS,

OF JENA, GERMANY.

STEREO-ISOHYPSOGRAPH.

To all whom it may concern Be it known that I, VVALTHER BAUnRsFELD, acitizen of the German Empire, residing at Jena, Germany, have invented anew and useful Stereo-Isohypsograph, of which the following is aspecification.

This invention relates to such copying devices comprising astereo-comparator system and a drawing device, each of which has atriple cross-slidesystem, as are set forth in the Patent 1,090,494, andmore particularly to the modification, in which the tracer height-slideand the tracer breadth-.

slide are carried by the tracer depth-slide.

With such a device the surface of a spatial object could be copied, ifthe photograms were taken with identical objectives and the axes of theobjectives were parallel to one another and perpendicular to thebase-line, in other words, if the photograms lie in one plane. I

The subject of the present invention is a device, which is sovconstructed that it can serve for utilizing photograms, in the takingthe said of which the axes of the objectives were certainlyas was the.case so farparallel to a plane containing the horizontal projection ofthe-base-line '(e. 91, as is assumed throughout thepresent application,to a horizontal plane), but had apart from this any inclination' to oneanother. according to the present invention the comparator'breadth-slide carries the two photograms, the movements of thecomparator breadth-slide and the comparator depth-' slide in the breadthdirection are trans mitted each by means of a lever to the cross-slidedevice of the tracer height-slide, breadth-slide and depth-slide,the twolevers being rotatably disposed parallel to a plane, which is determinedby the breadth-direction and the depth-direction of the copy-carrier,

and the point of application of one of the two levers being displaceablefor adjusting the device for a given. base-line in thebreadth-direction, relatively to that slide of the cross-slide,arrangement, which contains Olllt. 7 V I .I 4 Inor erothat the devicemay servefor utilizing photograms, at the taking of'which the objectiveaxes were each inclined to the base-line by an angle deviating by thesame amount from 90 (were uniformly-turned with respect to thebase-line), according to the additional invention the said displace-Specifi'eation'of Letters Patent.

tion the lever having the disp aceable point When in the device'Patented Aug. 31, 1915.

Application area Apri124, 1914. Serial No. 834,080.

taining the other point of application, which is equal to the relativedistance of the axes of rotation of the two levers. Another way ofcarrying out the invention, which is par-; ticularly suitable fromconstructional reasons, results from disposing the displaceable point ofapplication on a cross-slide in such a manner that it can bemovedparallel to the breadth-direction and parallel to thedepth-direction ofthe copy-carrier.

' When in the device accordin to the invenof application. is" formed asa two-armed lever, and when the said devicea comparator-system of theusual construction being usedis intended to be suitable for theutilization of photograms, during the taking of. which the objectiveaxes were each inclined by a different angle to the base-line (wereconvergent), the said lever is so formed that the two arms areadjustable relatively to one another in the plane of rotation ofthelever.

In the annexed drawing. Figure 1 is a diagram of a copyingdevice fittedwith the invention and Fig.2. is a plan view of a constructional exampleof such a device.

The heavy lines in Fig. 1 show the device, which is in the adjustingcondition for a photostereogram e, e, which has been securedassuming asimple casewith identical objectives, a horizontal base-line andhorizontal objective axes, which meet at a 100.

finite distance.- For the sake of simplicity the device for measuringheights and the comparator-system are not shown in the dia ram. Thelightly drawn lines servefor ex anation only.

he device comprises two two armed levers i, i and 70 k, which have totransmit the joint and relative displacements of the two photo ams inthe breadth-direction to a cross-sli e device a. The levers are to be11a .55 said angle p2,] From this there follows of.it-. selftheparallelismof k p and MI ,Since,-,

: when copyingthe'bo'dy :correspondingto the photostereogram e, 'e therelative 'diste l lof thepoints of application andjip on" the}cross-slide device andthe direction of their line o p remain unaltered,and" ermore the position of the points 7c. and k is invariable,itfollows, that for every position of the cross-slide arrangement thedirection and thesize of 10 p cor- :supposed as rotatable'in the planeof the breadth-direction.

drawing, the connecting line of their axes of rotation 5 and kdetermining the the two objective axes and the base-line is representedin the scale of reduction of the copy,.and in such a position that thelefthand extremity of the base-line lies in the axis of rotation 71 ofthe lever 11, i and the left-hand objective axis coincides with thelever-arm i. The point his the right-hand extremity of the base-line ande, z. e. the

i point of application of the lever-arm i on the cross-slide arrangement0, is the point of intersection of the two objective axes. The angle, bywhich the left-hand objective axis inclined to the perpendicular to thebaseline, lying in the plane of the drawing, (the turning-angle) ismarked a. The same angle v I is then also embraced by the base-line andthe breadth-direction. The lever-arm k is set in such a manner, that itis parallel to the right-hand objective axis and that its lengthk p tothe point of application p on the cross-slide device is e ual-to the leh I: o of the right-hand ob ective axis from the extremity of thebase-line to the point of mtersectlon 0 with the left-hand objec; tiveaxis. In order that this settingcorresponding to the length 5 k of thebase-line with the breadth-directionmay be effected,

the said point of application 1) isdisposed displaceably in the plane ofthe.drawing. I

For bringing the-said point into its correct position, the lever-arm kis set parallel to the lever-arm 21, its point of application p on thecross-slide arrangement lying. in one and the point of applicationisxdisplaced,

until it occupies the position 1),- in which positiontherelativedistanceof-p and is equal .to the length i 7c of theba'se-iline and theconnectinglines of 0 with C and connecting since furt of p withfp and ofp withflo embrace the o and p are the points.

respond to the direction and the size respectively of k 0. Hence, thedisposition of the lever-arms i and 1 0 indicated in the present case,replaces a disposition, in which the lever-arm 1.9 from its center ofrotation to its point of application p coincides directly with the sideha of the triangle i 10.

in order that a comparator-system of the usual construction may beemployed, the arm]:* of the lever 70, k must be disposed parallel to thedepth-direction, z. e., it must be supposed-to be adjustable relativelyto the arm k In Fig. 2 let the conditions, under which the plfotogramswere taken, be the'same as those forming the basis of the diagram inFig. 1. In order to beable to copy from.

. circular guide and an index k on the arm 76* permit of the twolever-arms being given any desired relative inclination. A screw 'wserves for clamping the levers together.

The stud p for the double lever is, k* is fitted to the upper slide 12.of a two-member cross-slide system 2 fitted to the breadth-slide B Ascrew 'w is provided for clamping the upper slide 12 on the. lower one pand a screw tv -1for clamping the'latter on the breadth-slide.

p which is itself- The operation of the device as shownin I the drawingis asfollows. and the angle a, which the latter embraces v of thebase-line in the scale of reduction of the copy and a the angle ofinclination of and the same depth-planewlth the point 0,

the left-hand objective axis relativelyto the [7 said slides by means ofthe screws wand Q0 he next gives the arms k is of the righthand leversuch a relative inclination that theindex k indicates on the scale [sthe angle contained by the axes of the objectives used when taking thephotostereogram, e.

the angle 5 0 k of Fig. 1. The clamping screw .wi'is then; tightened.The operator thereupon sets the height-slide A to the particular lineofheight desired and tightens" the screw w. Byrotating the two handwheelsthe operator is then enabled to follow, without removing his eyesfrom the oculars of the microscope, the heightline set for, the pencilat the same time tracing this line on the sheet of the drawing. On theline being completed. another heightis set for by means of the slide Aand this procedure is repeated until all the heightlines required havebeen traced.

I claim:

1. In a device for copying from a ste'reo scopic pair of photograms ofan object of three dimensions onto a plane surface the combination of astereo-comparator comprising three interdependent slides, A, B and L. adrawing device comprising three interdependent slides, A B and C ofwhich A and B are carried by C means comprising two levers forpositively coupling the slides of the said stereo-comparator with thoseof the said drawing device, means for displacing the point ofapplication of one of the two levers in the breadthdirection and in thedepth-direction relatively to that slide. which contains the said point.and a system of actuating devices .controlling the saidstereo-comparator and the said drawing device, the said system beingaccessible to the operator while he is looking into thestereo-comparator.

:2. In a device for copying from a stereoscopic pair of photograms of anobjectof three dimensions onto a plane surface the combination of astereo-comparator com- 5 prising three interdependent slides. A, B andC. a drawing device comprising three interdependent slides. A B and C,of which A and B are carried by C means comprising two levers forpositively coupling the slides of the said stereo-comparator with thoseof the said drawing device, one of which levers is formed as a twoarmedlever. the arms of which are adjustable relatively to one another in theplane of rotation of the lever. and has its point of applicationdisplaceable in the breadth direction and-in the depth-directionrelatively to that slide. which contains the said point. and a system ofactuating devices controlling'the said stereo-comparator and the saiddrawing device; the said system being acces ible to the operator whilehe is looking into the stereo-comparator.

WALTHER BAI'ERSFELD.

Witnesses:

Pan. Knficnn, Fnrrz LASDER.

